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Terunuma, Naohiro; Nagao, Yoshiharu; Yokouchi, Iichiro; Sato, Masashi
JAEA-Review 2007-034, 60 Pages, 2007/10
JAEA-Review-2007-034.pdf:36.36MB
Concentrations of radioactive elements in primary cooling water were measured by regular sampling on reactor operation of the JMTR. The JMTR core was converted to low enriched uranium core at the 108th operation cycle, and the refurbishment of the JMTR has been started after the 165th operation cycle. Measured results of concentrations of 
-ray release elements, radioactive iodine and tritium in primary cooling water were summarized during 108 - 165th operation cycles.
Fujiwara, Takeshi; Terunuma, Naohiro; Nakayama, Shinichi
no journal, ,
Sr-90 and Cs-137 are the main nuclides of heat generation in the high-level radioactive waste. To improve the flexibility of the disposal site design by attenuating the calorific value of the nuclides of heat generation, the evaluation of characteristics of waste including the nuclides of heat generation is advanced. The absorption method with the inorganic ion-exchangers is proposed as one of the methods of collecting the nuclides of heat generation. The inorganic ion-exchangers that adsorbed Sr and Cs became Sr-Cs sintered compact by heating it under pressurizing with a hot press device and its volume was less than half of initial inorganic ion-exchangers. It became an inhomogeneous sintered compact when the zeolite was contained. A homogeneous sintered compact was obtained when consisting only of the titanic acid.